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Originally Posted by Dave R
This is good advice. Some boats are so underpowered that this optimum hull efficiency speed can only be reached by really reving the heck out of the engine. Not a good thing for longevity.
Ideally, the optimum hull efficiency speed should fall close to the torque peak RPM of the engine, not the HP peak RPM. The torque peak of the engine is right where it has the best volumetric efficiency which means the intake system is operating at it's best at that engine speed and pumping losses are minimized.
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That is a perfect example of why the selling dealer should prop the boat correctly. Ideally, WOT RPM should reach the engine manufacturer's spec with the boat geared for use.